Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1975-10-23
1976-11-30
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 27, F16J 1534, F16J 1546
Patent
active
039945030
ABSTRACT:
An assembly for sealing against the escape of gas round a rotary shift where it exits from apparatus containing gas under pressure, such as a compressor, comprising an oil (or other sealing liquid) film seal means arranged where said shaft exits from the body of the apparatus and comprising an annular chamber surrounding said shaft and to be supplied with oil at a pressure above that of said gas in said apparatus, said annular chamber being axially closed by two axially spaced annular elements mounted on said shaft with radial clearance to provide a passage for oil to flow from said chamber between said annular elements and said shaft, and sealing means for preventing escape of gas in the event of a failure of the supply of oil to said annular chamber or stoppage of said apparatus and comprising an outer chamber, an annular piston in said outer chamber in engagement with said shaft through a labyrinth seal, and first and second seals, said first seal being connected with said piston and said second seal being fixed on said shaft, said seals being arranged so that they contact each other when the piston is moved in said one direction under the pressure of oil in said part of said outer chamber and are spaced apart when said piston is moved in said opposite direction under the action of said resilient means, closure of said closure valve being effected following failure of said oil supply or stoppage of said apparatus.
REFERENCES:
patent: 2984507 (1961-05-01), Welch
patent: 3176996 (1965-04-01), Barnett
patent: 3235269 (1966-02-01), Olesen
patent: 3360272 (1967-12-01), Blom et al.
patent: 3403915 (1968-10-01), Roberts
patent: 3529835 (1970-09-01), Lewis
patent: 3888495 (1975-06-01), Mayer
Dousse Georges
Etheimer Jean-Paul
Creusot-Loire
Smith Robert I.
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